6) what is/are the independent variables A-flow rate B-drag C-A and B D-crab ang

Question

6) what is/are the independent variables

   A-flow rate

   B-drag

   C-A and B

   D-crab angle

7) what is/are the dependent variables

   A- flow rate

   B- drag

   C- A and B

   C- crab angle

8) is the relationship between crab angle and drag (if any) statistically significant?

A- yes

   B- no, but almost

   C- not even close

   C- cannot be determined

9) what evidence did you use to determine your answer to the previous question?

A- y= -0.007x + 1.1

   B- r^2 = 0.84

   C- p < 0.001

   C- visual inspection of the data

Animals living in both air and water exist in a fluid medium, where motion of the fluid is a characteristic property of the environment. Blue crabs have maximum sensory detection when facing current, as shown in the left crab photo below, however, crab orientation to flow also affects the hydrodynamic forces they experience. The graph on the right shows the drag acting on crabs placed at different angles to the flow (y-0.007x 1.1; r2 0.84; p 0.001). Answer the following questions Crab angle () 45 90 75 60 30 15 0 Flow direction 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 Flow 0° 45° 90° Frontal orientation Sideways orientation

Explanation / Answer

Answers:

6. Option D

Crab angle

7. Option C

Both A and B

8. Option A

Yes

9. Option C

p is less than 0.0001

Explanation:

Independent variable means which doesn't influenced by others. Here by observing the graph the crab angle doesn't influenced by remaining two variables so crab angle is independent.

Dependent variable means which is influenced by others, here we observed from the graph drag and flowrates are directly proportional to each other if drag increase then flowrate also increase. So drag and flow rate are dependent variables.

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